AirHint found the following cheapest return flights from Boston (BOS) to San Jose (SJO) in January 2026 (see full year).

Return flights

14 Jan - 21 Jan	Copa
15 Jan - 20 Jan	Copa
02 Jan - 09 Jan	Copa
03 Jan - 09 Jan	Copa
03 Jan - 10 Jan	Copa
23 Jan - 30 Jan	United
15 Jan - 21 Jan	Spirit Airlines
11 Jan - 21 Jan	Spirit Airlines
14 Jan - 22 Jan	Spirit Airlines
14 Jan - 20 Jan	Spirit Airlines

Also check the deals for one-way flights from Boston to San Jose in January.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Boston to San Jose in January from 242€

Return flights